Machine for straightening and hammering saws



2 Sheets-Sheet 1.

Patented Apr. 10, 1888.

8 M. ,OOVEL,

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Zznesses (No Model.) 2 Sheets-Sheet 2. 7

M. GOVEL. MACHINE 'FOR STRAIGHTENING AND HAMMERING SAWS. No. 380,865. Patented Apr. 10, 1888.

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MILO OOVEL, OF CHICAGO, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 380,865, dated April 3.0, 1:888.

Application filed December 27. 1887. Serial No. 259,001. (No model.)

To all whom it 11mg concern:

Be it known that I, MILO CovEL, of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Machines for Straightening and Hammen ing Saws, of which the following is a full, clear, and exact description, that will enable others to make and use the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in that class of machines that are more especially intended for dressing band-saws; and the same consists of certain novel features in the construction, combination, and arrangement of the several parts, as will be hereinafter set forth.

Figure 1 is a side elevation of a machine embodying my improved features; Fig. 2, a horizontal section in the plane 2, Fig. 1; Fig. 3, a horizontal section in the plane 3, Fig. 1; and Fig. 4:, a vertical section in the plane 4., Fig. 3.

Referring to the drawings, A represents the supporting frame-work, which may be ofany suitable form or dimensions.

B B are two companion shafts arranged vertically, and have the two swaging-rolls B B mounted thereon. The upper ends of these shafts have suitable journal-bearings in the slide-blocks B" B which are provided with the downwardly -projecting parts a a, connected with the cross-head B, as shown in Figs. 1 and 4. This cross-head is constructed in two parts, which parts are connected by the bolted straps a o The vertical shafts B B pass down through the cross-head B and have bearings therein. The shaft B projects just far enough below the cross-head to have the pinion a rigidly mounted thereon, while the companion shaft B extends down to a point near the floor, as shown in Figs. 1 and 4. The shaft B is also provided with the lower journal-bearing, a the supporting ends of which are bolted to the lower ends of the standards 0 C, the upper ends of which extend above the top of the frame-work and are secured to the same by means of the bolts a The standards 0 O form guides for the vertical movement of the slide-blocks B B and the cross-head B in the vertical adjustment of the shafts B B. The spur-wheel O is feathered on the shaft B just underneath the lower bearing, so as to permit of a vertical movement of said shaft.

gages with the pinion b, rigidly mounted on the lower part of the vertical shaft O (see Figs. 1, 2, and 4,) which is in turn provided with suitable journal-bearings in the framework. The bevel gear-wheel O is mounted on the lower end of the shaft 0, and engages with the corresponding pinion, I), mounted on the inner end of the horizontal shaft 0*, journaled in the lower part of the frame-work, as shown in Fig. 2.

O is a gear-wheel mounted on the shaft 0, which engages with the pinion b",mounted on the companion horizontal driving-shaft O,having the band-pulleys O O, which receive the driving-belt from the motive power. By this system of shafts and gear-wheels the required motion is transmitted to the vertical shafts B B and the stretching and straightening rolls B B, mounted on the upper end of the same.

The connecting-band b is ordinarily composed of a strip of leather or other flexible material, and has one end attached to the cross-head B, the other end being-secured to the shaft If, so that when said shaft is rotated the band will be wound up or unwound in accordance with the direction in which the shaft is rotated. This shaft is operated by means of the hand-crank b and is for the purpose of raising andlowering the shafts B B, so as to bring the sWaging-rolls into position to have frictional contact with any particular spot on the surface of the saw-plate.

It is well known that there are some parts of a band-saw that require a little more straining and stretching than other parts, and there are also spots that require'a different treatment than they would receive by simply running the saw through with the same pressure on all parts alike. The faces of the rolls are less than the width of the saw, so that one edge may be strained without having contact with the other edge. The ratchet-wheel d and the pawl d lock the shaft b at any point to which the vertical shafts B B may be adjusted. The clamp D (see Fig. 4:) connects the upper ends of the standards or guides O O, and is attached at one end by means of the pivot-bolt d and adjustably secured at the opposite end by the clamping-bolt d, by which means the standards are stiffened against spreading or yielding and adjusted with reference to each other, so that the wear of the frictional contacting surfaces may be compensated for and the proper adjustment maintained. By slacking back on the bolt (i this end of the clamp or yoke D may be raised to permit of the insertion or removal of the endless saw. The normal position of the rolls B B as shown, is just far enough apart to permit of the easy insertion of the saw,which passes between the rolls in a vertical plane instead of lying flat. The roll B and the upper end of the shaft upon which it is mounted have also a slight lateral adjustment or movement, so as to clamp the saw between the two rolls. The inward pressure and movement are accomplished by means of the cam-shaft d and the hand-lever d mounted thereon, as shown in Fig, 4. This cam-shaft is journaled in the slide-block B and has a bearing against the standard 0 on that side. The lower end of the downwardlyextending part a of the slide-block B has a slight pivotalmovement on the boltd,in order to conform to the lateral movement of the roll B. The ends of the spring d are attached to the slide-blocks 13* B respectively, said spring serving to return the roll B to anormal position when released from the pressure of the cam-shaft.

By means of the cam-shaft and operatinglever the operation of the machine is easily controlled and the pressure on the saw-blade varied-that is, from very light to very heavy, as the different parts of the saw may require.

0n the table-bed D or top of the machine (see Fig. 3) are placed the anvil-blocks D D arranged diagonally and on opposite sides of the rolls ]3 B, so as to bring the faces of the anvils in line with the pathway of the saw and on the respective sides of the same,whereby either side of the saw may be hammered before and after passing through the rolls.

Practical experience has proven that in order to keep a saw in a first-class condition it must be hammered in addition to being passed between rollers. By this arrangement both the hammering and rolling process are jointly done in the same machine and in conjunction, thereby doing the work in a much more efficient manner and with greater facility than if performed separately, as either the rolls or anvils may be used, or both, without having to transfer the saw back and forth from one machine to another, a heavy saw requiring a number of persons to handle it.

The saw S, as shown in Figs. 3 and 4, is supported vertically edgewise when being dressed, instead of lying flat and passing between swaging-rolls occupying a horizontal position, as is usually the case. Holding the saw edgewise is the most natural position, as the same is less liable to be warped or sprung during the process of dressing, and the operator is enabled to carefully examine the surface of thesaw-plate by looking down over the same while standing in an erect position.

The rectangular bracket-plates E E are adjustably secured to opposite ends of the machine (see Fig. 1) at a point below and in line with the path of the saw. The faces of these plates will present a bright reflecting-Surface to bring out plainly to the eye of the operator all defects in the saw-plate as he looks downward over the same. These plates may be set at any desired angle with reference to theline of vision.

The shelf F (see Fig. 4) provides a convenient place for keeping the tools required for use in connection with the machine.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-

1. In a machine of the character herein set forth, the combination, with the supporting frame, of the vertical shafts B B, the sliding bearing-blocks in which said shafts are journaled, the companion swagingrolls rigidly mounted on the upper ends of said shafts,and means for imparting a vertical movement to said shafts, whereby the swaging-rolls may be brought to bear on any desired part of the sawplate, substantially as and for the purpose set forth.

2. In a machine of the character herein set forth, the combination, with the vertically-an ranged shafts having stretching and straight ening rolls on the upper ends thereof, of the slide-blocks 13* B provided with the downwardly-projecting parts a a, the cross-head B constructed in two parts and connected by the straps a a the standards and guides O O, the flexible band 1) the winding-shaft I), and the hand-crank for rotating said winding-shaft, substantially as and for the purpose set forth.

3. The combination, with the supportingframe, of the vertical shafts B B, the means described for transmitting motion from one to the other, the spur-wheel O, mounted on the vertical shaft B, the pinion b, the vertical shaft 0 on which said pinion is mounted, the bevel gear-wheel C, also mounted on the shaft 0", the bevel-pinion Z), the horizontal shaft 0, the gear-wheel G the pinion b, and the companion horizontal shaft 0, whereby the required motion is transmitted to the vertical shafts carrying the swaging-rolls, substantially as set forth.

4. The combination, with the standards or guides G O, of the clamp or yoke D, pivoted at one end to one of said standards and adjustably secured at the other end to the companion staudard, substantially as and for the purpose set forth.

5. In a machine of the character herein set forth, the combination, with the vertical shaft 13, having a swaging-roll mounted on the upper end thereof and adapted to have a slight lateral adjustment, of the shaft B, carrying the companion swaging-roll, the standard or guide 0 on that side, the cam-shaft d, and the hand-lever d whereby said roll is forced in the direction of the other by hand, and the spring al for automatically separating said rolls when released from the pressure of the cam-shaft, substantially as and for the purpose set forth.

6. In a machine of the character herein set forth, the combination, with the table-bed, of the anvil-blocks D D and the swaging-rolls, said anvils being placed on opposite sides of said rolls and arranged diagonally relative to each other for the purpose of bringing the faces of said anvils in line with the pathway of the saw and on opposite sides of the same, whereby the saw may be operated upon from either side 20 before or after the same has passed through the swaging-rolls, substantially as and for the purpose set forth.

7. Jointly with the saw stretching and straightening machine, the reflecting-platesE 2 5 E,adjustably secured to the frame-work of said machine and located at opposite ends of the same and in line with the path of the saw, substantially as and for the purpose set forth.

MILO COVEL.

Witnesses:

L. M. FREEMAN, L. B. COUPLAND. 

